Stable mononuclear and binuclear ruthenium(II) arene complexes with multiple N-donor poly-pyridyl ligands: synthesis, spectroscopic and structural characterization. Single crystal X-ray structure of [(eta(6)-C10H14)RuCl(bppz)]BF4

摘要

The reaction of 2,3-bis(2-pyridyl)-pyrazine (bppz) with dimeric chloro-bridged arene ruthenium complexes [((eta(6)-arene)RuCl2}(2)] (arene = p-cymene or hexamethyl benzene) gives highly stable cationic mono and binuclear complexes with the formulation [(eta(6)-C10H14)RuCl(bppz)](+) and [{(eta(6)-C H-10(14))RuCl}(2)(mu-bppz)](2+). On the contrary, reactions of the potential bridging ligand 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) or 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine (bptz) with the chloro-bridged dimeric arene ruthenium complexes [{(eta(6)-arene)RuCl2}(2)] under similar reaction conditions led to the formation of binuclear complexes with the formulation [{(eta(6)-arene)RuCl}(2)(mu-L)](2+) (where eta(6)-arene = p-cymene or hexamethyl benzene and L = tptz or bptz). The reaction products were characterized by various physico-chemical techniques, viz. elemental analyses, IR, H-1 - H-1 COSY, H-1-, C-13-NMR, FAB mass spectroscopy and electronic spectral studies. Molecular structure of the representative mononuclear complex [(eta(6)-C10H14)RuCl(bppz)]BF4 was determined by single crystal X-ray diffraction analysis. Crystal data: monoclinic, C-2/c, a = 16.103(5) Angstrom, b = 16.207(2) Angstrom, c = 19.124(2) Angstrom, beta = 91.61(2)degrees, Z = 8, R = 0.0714. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 82]